Fix quitting

[isenor]

After the other player has quit, the game should not continue - i.e. you shouldn't be able to do "done" and get the message that it's the other player's turn. You shouldn't be able to enter commands at all really. At the very least, there should be some state of the game which is "after" the game. Is may be best handled once we're able to set up the "end" of the game.